front mech size??

freeride-mike

what diameter front mech would be right for a frame tube diameter of 30mm......

28.4mm or 31.8mm ??? (are these size's min or max of the clamp?)

thanks
mike

nicklouse

what does it say on the seat clamp?

and the tube will not be 30mm it will be 28.4 or 31.8mm

what frame? year?

stu8975

Most modern mechs come in the biggest size..normally 34.9 and use reducer spacers to accommodate different tubing sizes.New mechs normally come with the spacers inc. (normally 2 sets)

freeride-mike

nicklouse wrote:

what does it say on the seat clamp?

and the tube will not be 30mm it will be 28.4 or 31.8mm

what frame? year?

frame: giant boulder 2006

post clamp is 34.9 but....... seat tube tapers in at bottom into approx 30mm where mech will sit? had a 34.9 XT mech but was too big!!

cheers

nicklouse

Ok that frame came with an E type front mech.

BB mounted.

see info here

http://techdocs.shimano.com/media/techd ... 608815.pdf

freeride-mike

cheers for that, must say never seen 1 like that before :?

can u fit a conventional 1 with shims?? or should i be looking for this e type mech??

nicklouse

nope.

you will need an E type and an E type BB or use one less spacer on an external bb set up.

or you could bodge up some spacers to make a mech fit but not advisable.

freeride-mike

nicklouse wrote:

or you could bodge up some spacers to make a mech fit

freeride-mike

My 31.8mm alivio mech has come today and no bodging requied as its a pefect fit not a shim in sight